Napoleonic Code [1804--shortly after the Louisiana Purchase treaty]. If I recall correctly, a key component of the Thirty Years War was bringing disparate collections of 'local laws' into a 'uniform system' and that the advent of the Napoleonic Code would serve to bring about just that. Ultimately it may have arisen out of a conflict between Roman Law and French/Local common law and Christian orthodoxy. Interestingly enough, Catholic France allied with Protestants against the Habsburgs. The Thirty Years War is also suggested to have been a time of 'racial genocide' in Europe. The war ended with the Peace of Westphalia. The roots of the war some suggest go back to the conflicts between Lutherans (Protestant) and Catholics (see: Diet of Speyer [1526]). That said:
The categories of the Napoleonic Code were not drawn from earlier French laws, but instead from Justinian's sixth-century codification of Roman law, the Corpus Juris Civilis and, within it, the Institutes.[2] The Institutes divide law into the law of:
- persons
- things
- actions.
Similarly, the Napoleonic Code divided law into law of:
- persons
- property
- acquisition of property
- civil procedure (removed into a separate code in 1806).